Competitions

# PP2. Week 6: April 12 - 18

# Complex numbers: addition and subtraction

Two complex numbers are given. Find their sum or difference.

#### Input

Each line contains an example of addition or subtraction of complex numbers. The complex number is given in the format **a**+**bi** or **a**-**bi**, where **a** is integer, **b** is non-negative integer. The real and imaginary part of each complex number is no more than `10`

by absolute value.^{9}

#### Output

For each input example, print in a separate line the answer.

Input example #1

2+3i + 7-4i 12-4i - 5-4i -1-1i - -1-1i 5-2i - -7+12i

Output example #1

9-1i 7+0i 0+0i 12-14i